Hello! New here. I have a 1999 Honda Accord LX, 2.3L 4 cylinder manual.

As of recently I've noticed a slight vibration in the steering wheel when at idle. I wouldn't call it severe by any means. I've noticed that, when I first start my car in the morning, it won't be vibrating - but as the engine warms up, that's when I feel it. If I stop at the grocery store or something quick and hop back in 5 minutes later to start driving again, it'll be vibrating upon starting the car. I don't have my heat or A/C running when this is happening. I don't know if it keeps going as I'm driving because the feeling of the road and everything drowns it out. It dulls down but does not completely disappear when I'm in neutral, and gets a little more aggressive when I put it in reverse.

I just replaced my spark plugs a few days ago. The last time my car was in the shop (about a month ago) it wasn't throwing any codes for misfires.

Hoping someone can guide me in the right direction as to what it could be. I'm a car newbie and don't have a lot of knowledge/experience yet. Thank you so much in advance if you took the time to read/answer!

 

When you start you car in the morning the engine is cold and the rpms are higher so you dont feel the vibration..as the engine warms it lowers to normal idle..i had the same car and I also felt the slight vibration..its normal in my opinion especially on a older vehicle..

 

Has the EGR valve, EGR passages and the Idle Air Control Valve (IACV) been cleaned in say the last 50k miles? Air filter clean?

 

Your car is old enough that your motor mounts are probably well worn. Given the fact that it worsens when you shift in reverse suggests to me that this might be the case.

You should inspect them to see if they are worn, cracked, or broken. Replace accordingly.

 

I concur about cleaning the IACV. I did this and improved my idle vibrations but they came back, then I just replaced it since it's only $25.